An internal welding system for u-rib

Abstract

This invention discloses an internal welding system for U-ribs. The internal welding system includes a base, a flux supply device, a positioning mechanism, a wire feeding tube structure, and a welding torch. The base is equipped with a bottom roller device. The positioning mechanism is mounted on the base and includes a vertical positioning mechanism and a welding torch positioning mechanism. The vertical positioning mechanism is used for vertical positioning of the base. The internal welding system of this invention can achieve stable and reliable positioning within a confined internal space, ensuring weld quality.

Description

Technical Field

[0001] This invention relates to welding technology, and more specifically to an internal welding system for welding the inner corner seam of a U-rib. Background Technology

[0002] In the field of steel structure welding for bridges and buildings, welding of structures in confined spaces is frequently encountered, especially the welding of long fillet welds between the U-ribs of steel box girders and the bridge deck. Currently, single-sided welding is used on the outside of the U-rib. In order to achieve the required penetration depth in the direction of the U-rib plate, a bevel is usually made on the outside of the U-rib and double-wire or multi-pass high-current fillet welding is used. However, since the U-rib is long, generally more than 10 meters, it is difficult to ensure that the bevel size, blunt edge, gap and flatness of the base plate are consistent during processing and assembly. The quality of the U-rib fillet weld is difficult to guarantee, and defects such as incomplete fusion, weld penetration, weld beads, undercut and insufficient penetration rate often occur, which seriously affect the safety of the structure.

[0003] To improve the performance of U-rib welds, it is necessary to achieve full penetration and defect-free welding of the U-rib. One method is to perform double-sided welding both inside and outside the U-rib. Due to the long length of the U-rib and the small internal space, achieving stable and reliable positioning within this confined space and ensuring high-quality flux application are crucial for guaranteeing weld quality. Existing internal welding systems suffer from a series of problems, including difficulty in positioning, unstable operation, uneven flux application, flux spillage, and easy damage to the wire feed tube. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides an internal welding device that can make full use of the small internal space to achieve reliable and stable positioning of the internal welding device, and ensure the quality of flux application and welding.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] An internal welding system for the inner corner seam of a U-rib, the internal welding system comprising a base, a flux supply device, a positioning mechanism, a wire feeding tube structure and a welding torch, wherein the base is provided with a bottom roller device, the positioning mechanism is disposed on the base, the positioning mechanism comprises a vertical positioning mechanism and a welding torch positioning mechanism, the vertical positioning mechanism is used for vertical positioning of the base, and the bottom roller device comprises bottom rollers.

[0007] Specifically, the axis of the bottom roller is above the center plane of the base.

[0008] Specifically, the bottom roller device includes an axle with a mounting plane, and the axle is fixed to the upper plane of the base via the mounting plane.

[0009] Specifically, the bottom roller is a rigid roller; preferably, the bottom roller is a steel roller.

[0010] Specifically, the cross-section of the rim of the bottom roller is V-shaped.

[0011] Specifically, the bottom roller device includes a bottom roller with a fixed structure on one side.

[0012] Specifically, the vertical positioning mechanism includes a first vertical positioning mechanism and a second vertical positioning mechanism, and the welding torch is disposed between the first vertical positioning mechanism and the second vertical positioning mechanism.

[0013] Specifically, the vertical positioning mechanism includes a top roller and a vertical drive device for driving the top roller to rise and fall, wherein the wheel axis of the top roller is parallel to that of the bottom roller; preferably, the top roller is a steel roller covered with rubber.

[0014] Specifically, the inner welding device includes side wheels, which are disposed on both sides of the inner welding device. The side wheels are connected to the base, and the wheel axis of the side wheels is in the vertical direction.

[0015] Specifically, the wire feeding tube structure includes a long-distance wire feeding section, a flux section, and a welding torch section; the welding torch section is a wire feeding hose; the long-distance wire feeding section includes a wire feeding hose and a rigid tube outside the wire feeding hose; the flux section includes a wire feeding hose and a protective sleeve outside the wire feeding hose; preferably, the rigid tube is a steel pipe; preferably, the protective sleeve is a metal sleeve.

[0016] In another aspect, the present invention provides an internal welding system for the inner corner seam of a U-rib. The internal welding system includes a flux supply device, a flux preparation device, and a welding torch. The flux preparation device is used to prepare the flux applied to the weld corner by the flux supply device. The flux preparation device is disposed between the flux supply device and the welding torch.

[0017] Compared with the prior art, the beneficial effects of the present invention are at least as follows: The vertical positioning mechanism and welding torch positioning mechanism of the present invention are ingeniously designed, effectively utilizing the narrow space inside the U-rib to achieve vertical and lateral positioning. By placing the central wheel axis of the bottom roller above the upper plane of the base, the height of the base is effectively reduced, the space above the base is increased, and the narrow space inside the U-rib is fully utilized. Furthermore, the center of the internal welding device is lowered, resulting in more stable operation. The presence of a vertical positioning mechanism at the front and rear of the welding torch ensures precise and stable vertical positioning of the welding torch, reducing vibration and swaying during movement and improving welding quality.

[0018] The flux supply device of this invention has a simple structure, a large capacity to ensure the application length, convenient control, stable operation, and can accurately control the flux application position and amount, ensuring uniform flux application and guaranteeing welding quality. By incorporating a flux gathering device, the flux can be perfectly concentrated at the weld joint, resulting in a simple structure and excellent performance.

[0019] The steel pipe installed outside the long-distance wire feeding section can also protect the inner wire feeding hose, preventing pipeline damage. The steel pipe installed outside the flux section can also protect the inner wire feeding hose, preventing pipeline damage, and the steel pipe structure can also easily fix the wire feeding tube to the flux supply device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an orthogonal anisotropic plate element.

[0021] Figure 2 This is a schematic cross-sectional view of a U-rib assembly for an orthotropic plate element.

[0022] Figure 3 This is a schematic diagram of the overall structure of the internal welding system of the present invention.

[0023] Figure 4 This is a cross-sectional schematic diagram of the welding of a U-rib by the internal welding system of the present invention.

[0024] Figure 5A This is a schematic diagram of the overall structure of the internal welding device of the present invention.

[0025] Figure 5B This is a side view of the overall structure of the internal welding device of the present invention.

[0026] Figure 6A This is a schematic diagram of the double-sided fixing structure of the bottom roller device of the present invention.

[0027] Figure 6B This is a schematic diagram of the single-sided fixing structure of the bottom roller device of the present invention.

[0028] Figure 7A This is a schematic diagram of the wheel rim structure of the present invention.

[0029] Figure 7B This is a cross-sectional view of the wheel rim of the present invention.

[0030] Figure 8 This is a schematic diagram of the vertical positioning mechanism of the present invention.

[0031] Figure 9A This is a schematic diagram of the welding torch positioning mechanism of the present invention.

[0032] Figure 9B This is a front view of the welding torch positioning mechanism of the present invention.

[0033] Figure 10 This is a three-dimensional schematic diagram of the flux supply device of the present invention.

[0034] Figure 11 This is a cross-sectional schematic diagram of the flux supply device of the present invention.

[0035] Figure 12 This is a three-dimensional structural diagram of the flux supply device of the present invention.

[0036] Figure 13 This is a schematic diagram of the wire feeding mechanism of the present invention.

[0037] Figure 14 This is a schematic diagram of the internal welding system according to another embodiment of the present invention.

[0038] Figure 15A This is a three-dimensional schematic diagram of another embodiment of the present invention with some structural elements omitted.

[0039] Figure 15B for Figure 15A A top view of part of the structure.

[0040] Figure 15C for Figure 15A Front view of part of the structure.

[0041] Figure 16 This is a schematic cross-sectional view of the baffle of the flux handling device of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "lateral," "longitudinal," "top," "bottom," "inner," "outer," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. The interpretation of these terms should be made from the perspective of someone skilled in the art.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly from the perspective of someone skilled in the art. For example, "connect" can be a fixed connection, a detachable connection, or an integral part; "link" can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] like Figure 1 The diagram shows a welded structure of an orthotropic plate unit. This orthotropic plate unit includes a steel plate 1 and U-ribs 2. Each orthotropic plate unit is welded together from several U-ribs 1 and a panel 2, forming a narrow, elongated cavity between the panel 1 and the U-ribs 2. A longitudinal weld is formed at the junction of the panel and the U-ribs. In actual use as a bridge deck, the steel plate 1 faces upwards, and the U-ribs 2 face downwards.

[0047] Figure 2 This is a cross-sectional schematic diagram of an orthotropic plate unit with one U-rib assembly. Steel plate 1 is structural steel with a thickness B1 ≥ 12mm, and its performance and processing accuracy meet relevant industry standards. U-rib 2 is structural steel with a thickness B2 ≥ 6mm, height H ≥ 250mm, upper opening width Wa ≥ approximately 250mm, and lower bottom width Wb ≥ 150mm. It is rolled or cold-bent, and its performance and processing accuracy meet relevant industry standards. The U-ribs are positioned and arranged on the steel plate according to design requirements, with the U-ribs as close to the steel plate as possible. After the U-ribs are positioned on the steel plate, the inner and outer corner seams on both sides of the lower corner of the U-rib are welded. This invention provides an internal welding system for submerged arc welding of the inner corner seams of U-ribs.

[0048] Figure 3 This is a schematic diagram of the overall structure of the internal welding system. Figure 4This is a cross-sectional schematic diagram of the internal welding system welding a U-rib. The internal welding system includes a welding torch 3, a positioning mechanism 4, a flux supply device 5, a wire feeding mechanism 6, a connecting arm 7, a welding power source, and a control box 8. The welding torch 3 of the internal welding system performs welding within the elongated, narrow cavity formed between the panel and the U-rib. Figure 4 (The wire feed tube is omitted). To improve welding efficiency, the internal welding system simultaneously welds multiple U-ribs, featuring multiple internal welding devices arranged side-by-side. Figure 3 The illustrated embodiment has six units. This internal welding device can perform welding on the inside of the U-rib. The internal welding device is symmetrical in the transverse structure. Each internal welding device has a welding gun on each of its left and right sides, which can simultaneously weld the two corner seams on the inside of the U-rib along the longitudinal direction, so as to realize the simultaneous welding of the left and right weld seams on the inside of the U-rib, further improving the welding efficiency.

[0049] like Figure 5A and 5B The internal welding system includes a base 100 and a bottom roller assembly 200. The positioning mechanism 4 includes a vertical positioning mechanism 500 and a welding torch positioning mechanism 400. The bottom roller assembly 200 is mounted on the base 100. The vertical positioning mechanism 500 and the welding torch positioning mechanism 400 are mounted on the base 100. The welding torch 3 is connected to the welding torch positioning mechanism 400, which is mainly used for the lateral positioning of the welding torch and for adjusting the angle of the welding torch. The vertical positioning mechanism is used for the vertical positioning of the base.

[0050] like Figure 6A and 6BThe bottom roller device 200 includes a bottom roller 201 and a wheel axle 202. The central wheel axis of the bottom roller is transversely along the base, and the bottom roller can rotate around the wheel axis, extending through the lower plane 101 of the base 100. The wheel axis of the bottom roller is above the central plane of the base. The central plane of the base is the plane between the center of the upper plane 102 and the lower plane 101 of the base. It is understood that the upper plane of the base is not necessarily the uppermost plane of the base, and the lower plane of the base is not necessarily the lowermost plane of the base. Here, the upper plane of the base can be understood as a reference plane for setting up structures such as the vertical positioning mechanism 500 and the welding torch positioning mechanism 400. In the figure, the base of this embodiment is plate-shaped. In fact, the base can also be a hollow bottom truss structure, as long as the vertical positioning mechanism, welding torch positioning mechanism, etc. can be set on it. Preferably, the central wheel axis L of the bottom roller is above the upper plane 102 of the base. Setting the central wheel axis of the bottom roller above the upper plane of the base can effectively reduce the height of the base, increase the space above the base, and effectively utilize the narrow space inside the U-rib. Furthermore, the lower center of the inner welding device results in more stable operation. The axle 202 has a mounting plane, which is fixed to the upper plane 102 of the base. Specifically, the mounting plane includes an upper mounting surface 2021 and a lower mounting surface 2022. The lower mounting surface of the axle contacts the upper plane of the base. A fixing screw 203 passes through the upper mounting surface 2021 and secures the axle to the base. The bottom roller is a rigid roller. Preferably, the bottom roller is made of steel. During welding, the bottom roller contacts the panel, supporting the inner welding device. When the inner welding device moves inside the U-rib or the U-rib moves relative to the inner welding device via the bottom roller, the frictional force is small. Preferably, the contact line between the bottom roller and the panel is short, approximately a point contact.

[0051] like Figure 7A and Figure 7B The bottom roller's rim has a V-shaped cross-section (2011). This V-shaped structure reduces the contact between the bottom roller and the panel, approximating point contact, thus minimizing friction. It also avoids roller vibration and instability caused by uneven base plate, reducing the impact on the welding torch and improving welding quality. At least three bottom rollers should be installed: one at the front and two symmetrically arranged at the rear. This improves the stability of the relative movement of the inner welding device within the U-rib. The number and position of the bottom rollers can be appropriately increased depending on the base plate length and structural layout.

[0052] The bottom roller device 200 has a double-sided fixing structure 2001. Figure 6A (as shown) and single-sided fixed structure 2002 ( Figure 6B (As shown). Figure 5AIn the illustrated embodiment, the positioning mechanism 4 has five bottom rollers on its base 100. One roller is located at the front, two in the middle, and two symmetrically arranged at the rear. The two middle bottom rollers use a single-sided fixing structure 2002, secured on one side with two fixing screws. The front and rear bottom rollers use a double-sided fixing structure 2001. The two middle rollers are mounted on both sides of the base, very close to the U-rib. Due to structural space and size limitations, a single-sided fixing structure is used, achieving the same fixing effect as a double-sided structure, but saving space.

[0053] like Figure 8 The base 100 also includes a vertical positioning mechanism 500. The vertical positioning mechanism 500 includes a vertical drive mechanism. In this embodiment, the vertical drive mechanism is a vertical cylinder 501, and the vertical positioning mechanism also includes a top roller 502. The top roller 502 is oriented in the same direction as the bottom roller, and the wheel axes of the top roller and the bottom roller are parallel. During welding, the vertical drive mechanism drives the top roller to move upwards and contact the top of the U-rib, thus achieving vertical positioning of the inner welding device. A portal frame 503 is longitudinally arranged on the base 100. The cylinder seat of the vertical cylinder 501 is fixed on the portal frame 503, and the vertical cylinder 501 is located inside the portal frame 503. The vertical piston rod 504 of the vertical cylinder 501 passes through the top of the portal frame 503 and connects to the top roller. Specifically, a guide sleeve 509 is provided on the portal frame 503, and a guide post 505 is disposed inside the guide sleeve 509 and can move up and down within the guide sleeve. A support plate 506 is provided at the upper end of the guide post 505, and the support plate 506 is fixedly connected to the guide post 505. The vertical piston rod 504 of the vertical cylinder 501 passes through the portal frame 503 and is fixedly connected to the support plate 506. A first vertical plate 507 and a second vertical plate 508 are provided on both sides of the support plate 506, and the top roller 502 is set between the first vertical plate 507 and the second vertical plate 508 via a shaft. The vertical positioning mechanism 500 is symmetrically arranged, with the vertical cylinder 501 located in the middle of the portal frame 503 and the guide sleeve 509 located on both sides of the portal frame 503. During welding, the vertical cylinder 501 drives the vertical piston rod 504 to move upward, thereby causing the top roller 502 to press against the top of the U-rib, increasing the stability of relative movement during welding. The top roller is made of steel roller with a 6mm thick rubber coating. The structure, which uses steel rollers with an outer rubber layer, has both strength and elasticity, thus eliminating the impact of deformation during the U-rib manufacturing process on the welding gun positioning device.

[0054] like Figure 5AAs shown, preferably, the vertical positioning mechanism includes a first vertical positioning mechanism 5001 and a second vertical positioning mechanism 5002, with the welding torch 3 positioned between the first vertical positioning mechanism 5001 and the second vertical positioning mechanism 5002. By providing a vertical positioning mechanism at both the front and rear of the welding torch, the welding torch is positioned accurately and stably in the vertical direction, reducing vibration and shaking during movement and improving welding quality.

[0055] In this embodiment, there are two independent vertical positioning mechanisms. In another embodiment (not shown), the vertical positioning mechanism can also be set as a whole, for example, by connecting two vertical positioning mechanisms together, as long as at least one top roller is provided at the front and back of the upper part of the welding torch to achieve front and back positioning of the welding torch.

[0056] like Figure 9A and 9B The base 100 also includes a welding torch positioning mechanism 400. The welding torch 3 is connected to the welding torch positioning mechanism 400, which includes a transverse drive mechanism for pressing the welding torch 3. In this embodiment, the transverse drive mechanism is a transverse cylinder 401. The welding torch positioning mechanism 400 also includes a slider 404, a connecting block 405, and a fixing plate 407, with the welding torch fixed to the fixing plate 407. Both the fixing plate 407 and the connecting block 405 are connected to the slider 404. The cylinder seat of the transverse cylinder 401 is mounted on a fixed seat 402, which is fixed to the base 100. The fixed seat 402 is transversely positioned and perpendicular to the portal frame. A slide rail 403 is provided on the side of the fixed seat 402, and the slider 404 is mounted on the slide rail 403, allowing it to slide transversely along the slide rail 403. The transverse piston rod 406 of the transverse cylinder 401 is connected to the connecting block 405. The fixed plate 407 also has a transverse limiting wheel 408. During welding, the transverse cylinder 401 drives the transverse piston rod 406 to move laterally, which in turn drives the slider 404 to move outward along the slide rail 403 until the transverse limiting wheel 408 contacts the side of the U-rib.

[0057] The welding torch 3 is fixed to the fixing plate 407 by a fixing clamp 301. The fixing plate 407 also has a vertical oblong hole 409 and a horizontal oblong hole 410. Screws connect the fixing plate 407 to the slider through the vertical oblong hole 409, facilitating the adjustment of the fixing plate's height. Screws fix the horizontal limiting wheel 408 to the fixing plate 407 through the horizontal oblong hole 410, allowing adjustment of the horizontal position of the horizontal limiting wheel. The fixing clamp 301 has an adjustment hole 302, through which the angle of the welding torch can be adjusted. Screws fix the fixing clamp 301 to the fixing plate 407 through the adjustment hole 302.

[0058] During welding, adjust the height of the fixing plate, the lateral position of the lateral limit wheel, and the angle of the welding torch. In this way, under the action of the lateral cylinder 401, the welding torch 3 moves towards the weld seam inside the U-rib on both sides and presses against the weld seam inside the U-rib.

[0059] like Figure 5A and Figure 5B The positioning mechanism also includes side wheels 600. The side wheels 600 are located on both sides of the inner welding device and are fixedly connected to the fixed base 402. The wheel axis of the side wheels 600 is vertical. The side wheels are used to initially position the inner welding device relative to the inner surface of the U-rib, preventing large-scale displacement of the welding torch during welding and protecting the welding torch.

[0060] like Figures 10-12 The flux supply device 5 includes a container 1000 for holding flux, a dispensing port 2000, and a drive mechanism 3000. The drive mechanism 3000 has a power source that can drive a switch to control the opening and closing of the dispensing port. When the dispensing port switch is open, flux can flow out from the container 1000.

[0061] Specifically, the container 1000 has an inclined plate at its bottom, comprising a first inclined plate 1011 and a second inclined plate 1012. The first inclined plate 1011 and the second inclined plate 1012 extend along the length of the U-rib unit. The first inclined plate 1011 and the second inclined plate 1012 are configured in an inverted V shape. This inverted V-shape cleverly utilizes the U-rib space to form an inclined surface, allowing the material to flow smoothly downwards. Furthermore, the space below the inverted V-shaped inclined plate provides a passage for pipelines in the welding system, such as power lines, signal lines, and power (pneumatic) delivery pipes. This rationally and maximally utilizes the U-rib space.

[0062] Preferably, the inverted V-shaped tops of the first inclined plate 1011 and the second inclined plate 1012 are provided with partitions 1004. The partitions ensure that the flux distribution on both sides is relatively uniform during internal welding, ensuring that the flux on both sides is used up simultaneously to achieve the maximum application length, thereby avoiding uneven flux distribution on both sides that would result in no flux being applied to the last side. Moreover, compared to the case without partitions, the pressure provided to each discharge port is more uniform, and the vertical downward pressure is greater, resulting in smoother flow and ensuring that the flux falls steadily, thus improving the application quality.

[0063] The first inclined plate 1011 and the second inclined plate 1012 are arranged symmetrically. The first and second inclined plates form a certain angle with the horizontal plane. The angle between the first inclined plate 1011 and the second inclined plate 1012 and the horizontal plane is 30-60 degrees. If the inclination angle is too small, the flux faces great downward resistance and is difficult to fall, and the space left for the pipeline is limited; if the inclination angle is too large, the container volume becomes small, and there is not enough flux to hold. Setting the angle between the first inclined plate 1011 and the second inclined plate 1012 and the horizontal plane to 30-60 degrees can effectively solve the above problems. It allows the flux to fall naturally and stably, ensures sufficient container space to hold enough flux, and provides reasonable space below the container for the pipelines of the welding system to pass through. Preferably, the angle between the first inclined plate 1011 and the second inclined plate 1012 and the horizontal plane is 35-45 degrees. In this embodiment, the angle between the first inclined plate 1011 and the second inclined plate 1012 and the horizontal plane is 40 degrees.

[0064] Furthermore, the container for holding the flux has container side plates. The container side plates include a first side plate 1021 and a second side plate 1022. The first side plate 1021 and the second side plate 1022 extend along the length direction of the U-rib unit. The side plates are inclined surfaces, and the first side plate 1021 and the second side plate 1022 form certain angles with the first inclined plate 1011 and the second inclined plate 1012, respectively. The structure defined by the inclined plates and the side plates provides a space for containing the flux. The first side plate 1021 has the same inclination direction as the first inclined plate 1011, and the second side plate 1022 has the same inclination direction as the second inclined plate 1012. Preferably, the inclination angles of the first side plate 1021 and the second side plate 1022 relative to the horizontal plane are equal to or less than the inclination angle of the U-rib side plate relative to the horizontal plane. Generally, the U-rib side plate has an inclination angle of 78 degrees relative to the horizontal plane. Therefore, the angle between the first side plate 1021 and the second side plate 1022 and the horizontal plane is less than or equal to 78 degrees. The inclination direction of the container side plates is the same as the inclination direction of the U-rib side plate, maximizing the container volume.

[0065] The container for holding flux also has end plates. The end plates include a first end plate 1031 and a second end plate 1032. The first end plate 1031 and the second end plate 1032 are disposed at both ends of the container side plate. Preferably, the first end plate 1031 and the second end plate 1032 are perpendicular to the horizontal plane.

[0066] The length of the flux container can be set according to the length of the U-rib to be welded. In this invention, the length of the flux container is 0.5-1.5m. Setting the length to 0.5-1.5m ensures that at least one U-rib with a length of 15m or more is coated with flux in one pass.

[0067] Preferably, the driving mechanism 3000 includes a first driving mechanism 3001 and a second driving mechanism 3002. The first driving mechanism 3001 is located at one end of the flux supply device and is connected to one end of the opening and closing mechanism of the flux supply device that controls the opening and closing of the flux outlet. The second driving mechanism 3002 is located at the other end of the flux supply device and is connected to the other end of the opening and closing mechanism of the flux supply device that controls the opening and closing of the flux outlet, i.e., the switch. In this embodiment, the opening and closing mechanism is a sliding plate 3010, with both ends of the sliding plate 3010 extending outside the container 1000. The first and second driving mechanisms are respectively connected to both ends of the sliding plate 3010. In this embodiment, the sliding plate is located above the flux outlet. Because the sliding plate is relatively long, the opening and closing of the sliding plate is subject to flux pressure, resulting in significant resistance. By adopting a dual-drive approach at both ends, the sliding plate can be moved smoothly, improving the flux application quality.

[0068] like Figure 13The wire feeding mechanism 6 includes a wire spool 601, a wire feeder 602, and a wire feeding tube structure 603. The wire feeding tube structure includes a long-distance wire feeding section S1, a flux section S2, and a welding torch section S3. The long-distance wire feeding section S1 is the section of the wire feeding tube from the wire spool to the wire feeder, and it is mounted on the connecting arm 7. The flux section S2 is the section of the wire feeding tube from the wire feeder to the point where it exits the flux supply device 5, and it is mounted on the flux supply device 5. The welding torch section S3 is the curved portion near the welding torch, which is the section of the wire feeding tube from the flux supply device to the welding torch, and it connects to the welding torch 3. The welding torch section is a flexible wire feeding hose, and the long-distance wire feeding section includes a flexible wire feeding hose and a rigid tube outside the flexible wire feeding hose. The length of the long-distance wire feeding section is adapted to the length of the connecting arm, with a total length of 10-20m. Preferably, the rigid tube outside the flexible wire feeding hose is segmented, with each segment being 3-5m long. The rigid tube is a steel pipe that will not bend naturally. By encasing the wire feeding hose in a steel pipe, not only are the advantages of the wire feeding hose retained, but the external steel pipe also prevents the pipeline from coiling. The welding environment is harsh, and the wire feeding hose is easily damaged; the external steel pipe also protects the inner wire feeding hose, preventing pipeline damage. The flux section includes the wire feeding hose and a protective sleeve on the outside of the wire feeding hose. The length of the flux section is adapted to the length of the flux supply device, and the flux section length is 0.5-2m. The protective sleeve of the flux section is a rigid pipe made of metal. Preferably, the protective sleeve is a steel pipe. Preferably, the steel pipe material of the flux section is the same as that of the long-distance wire feeding section. Since the flux section is located above the flux supply device, it comes into contact with the wire feeding hose when adding flux. The external steel pipe also protects the inner wire feeding hose, preventing pipeline damage, and the steel pipe structure also allows for easy fixing of the wire feeding hose to the flux supply device. In this embodiment, a fixing hole can be provided above the end plate of the flux supply device, and the flux section passes through the fixing hole of the end plate and is fixed to the flux supply device. By adding a rigid protective sleeve to the outside of the wire feeding hose of the long-distance wire feeding section and the flux section based on the existing wire feeding hose, the wire feeding quality is ensured, the wire feeding tube is protected, and installation is convenient with good fixing effect. In the above solution, the wire feeding hose adopts the flexible wire feeding hose of the prior art. Here, flexibility means that it can be easily bent and deformed in the natural state. The rigidity in this invention is relative to the flexible hose, and it will not bend and deform in the natural state. It is understood that ordinary steel pipes and rigid plastic pipes are within the scope of the rigid pipe of this invention.

[0069] like Figure 14 This is a schematic diagram of another embodiment of the present invention. In this embodiment, the internal welding system includes a welding torch 3, a positioning mechanism 4, a flux supply device 5, a wire feeding mechanism 6, and a flux preparation device 9. The flux preparation device 9 is disposed between the flux supply device 5 and the welding torch 3. The flux preparation device 9 is used to prepare the flux applied by the flux supply device to the weld joint.

[0070] The flux preparation device has a preparation section with a preparation surface extending along the flux application direction, perpendicular to the horizontal plane or at a certain angle. The lower end of the flux preparation device is substantially on the same plane as the lower end of the roller, ensuring that during welding, the lower end of the preparation surface is essentially in contact with the welding panel. The preparation surface can block the flux applied at the weld joint, preventing it from scattering. Preferably, the preparation section also has a curved surface, seamlessly connected to the preparation surface. The curved surface can be an arc-shaped curved surface or a bend at a certain angle to the preparation surface. The curved surface is farther from the weld than the preparation surface, allowing it to collect and scrape any scattered flux onto the preparation surface, thus concentrating the flux at the weld joint.

[0071] like Figures 15A-15C In this embodiment, the flux handling device has a baffle 90 extending from one side of the flux supply device to the vicinity of the welding torch. The end of the baffle near the flux supply device is fixed, while the end near the welding torch expands outwards, i.e., towards the weld bead. The end near the welding torch is closer to the weld bead than the end near the flux supply device. The baffle is made of bent thin steel sheet, which is convenient to manufacture, reduces weight, and saves costs.

[0072] like Figure 16 The baffle has a connecting part 901, a bending part 902, and an extension part 903. The connecting part of the baffle of the flux handling device is fixedly connected to the base. The extension part 903 may or may not be fixed to the base.

[0073] The plane of the extension 903 on the weld side serves as a finishing surface, and the bending portion 902 has a bending surface. Through the bending portion 902 and the extension 903, the scattered flux can be collected and scraped onto the finishing surface, concentrating the flux at the weld corner and preventing it from scattering. In the figure, the extension 903 is perpendicular to the horizontal plane; this structure is the simplest. The bending portion is preferably linear, and the angle between it and the extension is preferably 30-45 degrees. Optionally, the extension can also form a certain angle with the horizontal plane, as long as the flux is concentrated at the weld corner and prevented from scattering.

[0074] Preferably, the baffle is elastic. The end of the baffle near the welding torch, i.e., the extension 903, is not fixed to the base and is in a free state. Allowing the extension to be in a free state increases the elasticity of the baffle. When there is a lot of flux, the extension can be compressed, allowing the flux to be fully applied to the weld joint instead of accumulating at the bend, ensuring uniform application and improving welding quality.

[0075] Specifically, the connecting part 901 of the baffle is connected to the protective plate 300 on the base. The connection method can be welding, screw connection, etc. In another embodiment, the flux preparation device is integrally formed with the protective plate. In another embodiment, the protective plate may be omitted, and only the flux preparation device 9 is provided, which is located between the flux supply device 5 and the welding torch 3. It extends from the flux supply device side to the vicinity of the welding torch.

[0076] The flux preparation apparatus of the present invention is not limited to use with the flux supply apparatus described above, but can also be used with other types of flux supply apparatuses. For example, it can also be used with flux supply apparatuses and flux application apparatuses in the prior art that cannot properly apply flux to the weld.

[0077] In this embodiment, the internal welding system also includes a protective plate 300. The protective plate 300 is disposed on both sides of the base. The protective plate can protect the rollers and the base, preventing flux from entering under the base and affecting movement.

[0078] In this embodiment, the internal welding system further includes a scraper device 10, which is located behind the welding torch and is used to scrape off the weld slag after welding. The scraper device is connected to the welding torch. The scraper device has a scraper head 1061, which is aligned with the weld seam.

[0079] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inner welding system for U-ribs, characterized in that: The inner welding system comprises a base, a flux supply device, a positioning mechanism, a wire feeding pipe structure and a welding torch, the base is provided with a bottom roller device, the positioning mechanism is arranged on the base, the positioning mechanism comprises a vertical positioning mechanism and a welding torch positioning mechanism, the vertical positioning mechanism is used for vertical positioning of the base, the bottom roller device comprises a bottom roller; the vertical positioning mechanism comprises a first vertical positioning mechanism and a second vertical positioning mechanism, the welding torch is arranged between the first vertical positioning mechanism and the second vertical positioning mechanism, so that the welding torch is accurately and stably positioned in the vertical direction, vibration and shaking in the movement process are reduced, and the welding quality is improved; the inner welding system further comprises a flux arrangement device, the flux arrangement device is used for arranging the flux laid by the flux supply device to the welding corner, and the flux arrangement device is arranged between the flux supply device and the welding torch; the flux arrangement device has a baffle, the baffle has elasticity; the baffle has a connecting part, a bending part and an extension part, the connecting part of the baffle is fixedly connected with the base; the extension part is not fixed with the base and is in a free state; the first vertical positioning mechanism and the second vertical positioning mechanism each comprise a top roller and a vertical driving device for driving the top roller to lift, the top roller is parallel to the wheel axis of the bottom roller; the top roller is a steel roller, and the steel roller is wrapped with rubber; the welding torch is connected with the welding torch positioning mechanism, the welding torch positioning mechanism comprises a transverse driving mechanism for clamping the welding torch, the transverse driving mechanism is a transverse cylinder, the welding torch positioning mechanism further comprises a sliding block and a connecting block, a fixed plate, the welding torch is fixed on the fixed plate, the fixed plate and the connecting block are connected with the sliding block, a transverse piston rod of the transverse cylinder is connected with the connecting block, and the fixed plate further has a transverse limiting wheel; during welding, the transverse cylinder drives the transverse piston rod to move transversely, drives the sliding block to move outward, and the transverse limiting wheel contacts the side surface of the U rib until the transverse limiting wheel contacts the side surface of the U rib.

2. The internal welding system of claim 1, wherein, The wheel axis of the bottom roller is above the center plane of the base.

3. The internal welding system of claim 1, wherein, The bottom roller device comprises a wheel shaft, the wheel shaft has a mounting plane, and the wheel shaft is fixed on the upper surface of the base through the mounting plane.

4. The internal welding system of claim 1, wherein, The bottom roller is a rigid roller.

5. The internal welding system of claim 1, wherein, The cross section of the rim of the bottom roller is V-shaped.

6. The internal welding system of claim 1, wherein, The bottom roller device comprises a bottom roller with a single-side fixing structure.

7. The internal welding system of claim 1, wherein: The inner welding system comprises side wheels arranged on both sides of the inner welding device, the side wheels are connected with the base, and the wheel axes of the side wheels are in the vertical direction.

8. The internal welding system of claim 1, wherein: The wire feeding pipe structure comprises a long-distance wire feeding section, a flux section and a welding torch section; the welding torch section is a wire feeding hose; the long-distance wire feeding section comprises a wire feeding hose and a rigid pipe outside the wire feeding hose; the flux section comprises a wire feeding hose and a protective sleeve outside the wire feeding hose; the rigid pipe is a steel pipe; and the protective sleeve is a metal sleeve.

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